Write the following set in the tabular form and find their cardinal numbers $.$
$B = {x : x$ is a prime number of one digit $}$

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Solution

The tabular form or Roster form of the given set $B = {x : x$ is a prime number of one digit $}$ can be given as below
In the given set $x$ is a prime number of one digit $.$ Prime numbers are divisible by $1$ or itself
$2, 3, 5, 7$ are prime numbers of one digit.
$B = \{2, 3, 5, 7\}$
Cardinal number of the set $B$ is the number of elements in it $.$ It is denoted by $n (B)$
$n (B)$ $= 4$
Hence $,$ tabular form of given set is $B = \{2, 3, 5, 7\}$ and cardinal number is $4$ .

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